Date format change

Date format change

We are facing problems after changing the date format in all espaces from "mm-dd-yyyy" to "mm/dd/yyyy". (changed the date format from service center & published all the espaces).
We see broken pages, sometimes with an error message similar to - "Uncaught Extra/unparsed characters found in date: 01/01/1900"-"UICore.js?3898:4959"
Please Advise.